1) Chemical equation:
Mg + O2 -> MgO
2) Balanced chemical equation:
2Mg + O2 -> 2MgO
3) Ratios
2 mol Mg : 1 mol O2 : 2 mol MgO
4) Convert 2 grams of Mg to number of moles
Molar mass of Mg: 24.3 g/mol
# of moles = grams / molar mass = 2g / 24.3 g/mol = 0.0823 mol
5) Use the theoretical ratio fo find the number of moles of MgO produced
0.0823 mol Mg * 2mol MgO / 2 mol Mg = 0.0823 mol MgO
6) Use the molar mass of MgO to obtain the quantity in grams
Molar mass of MgO = 24.3 g/mol + 16 g/mol = 40.3 g/mol
0.0823 mol MgO * 40.3 g/ mol = 3.32 g
Answer: 3.32 g
Answer:
Carbon dioxide and water I believe because it is a combustion reaction
Answer:
B. It increases.
Explanation:
- We can use the general law of ideal gas: <em>PV = nRT.</em>
where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
It is clear that, at constant P, the volume of the gas (V) is directly proportional to the temperature of the gas.
<em>V ∝ T.</em>
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<em>So, If a balloon is heated, the volume of the air in the balloon if the pressure is constant:</em>
B. It increases.
BIOSPHERE AND LITHOSPHERE INTERACTION